I think a lot of threads would benefit from key posts ('owners' club threads with specific game fixes, for instance). As far as I know that's not available to anyone but moderators. I think key posts might get conflated with 'likes' if it's an option made available to the masses, but perhaps the option to nominate posts would help balance assisting users in finding important information without diluting the feature. Moderators (and/or maybe the thread OP) could review the key post nominations and make a decision on whether that post deserves elevation.